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    Researchers observed and controlled subharmonic mode excitation in Kerr optical frequency combs using crystalline resonators. This phenomenon creates controllable multiscale combs with applications in advanced optics.

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    Area of Science:

    • Optics and Photonics
    • Resonator Science
    • Nonlinear Optics

    Background:

    • Kerr optical frequency combs are crucial for precise frequency measurements and signal generation.
    • Whispering-gallery mode resonators offer compact and efficient platforms for nonlinear optical phenomena.

    Purpose of the Study:

    • To experimentally observe and characterize subharmonic mode excitation in Kerr optical frequency combs.
    • To demonstrate control over generated subcombs and their spectral span.
    • To investigate the spatial characteristics and underlying mechanisms of these multiscale combs.

    Main Methods:

    • Generation of primary Kerr optical frequency combs using crystalline whispering-gallery mode resonators.
    • Experimental observation and characterization of subharmonic mode excitation.
    • Spatial domain analysis of intracavity patterns.
    • Theoretical analysis using eigenvalue decomposition.

    Main Results:

    • Experimental confirmation of subharmonic mode excitation in Kerr combs.
    • Demonstration of controllable subcombs spanning single or multiple free spectral ranges.
    • Observation of multiscale combs corresponding to amplitude modulation of intracavity roll patterns.
    • Theoretical evidence for the excitation mechanism via eigenvalue decomposition.

    Conclusions:

    • Subharmonic mode excitation provides a novel pathway for generating controllable multiscale Kerr optical frequency combs.
    • The findings offer insights into the fundamental physics of nonlinear phenomena in resonators.
    • This work paves the way for advanced applications in optical signal processing and metrology.